package cn.lcsjsxy.yxc.ioandnetwork;

import org.junit.jupiter.api.Test;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

/*
    实现TCP的网络编程
    例子1：客户端发送信息给服务端，服务端将数据显示在控制台上
 */
public class TCPTest1 {
    //客户端
    @Test
    public void client(){
        Socket socket= null;
        OutputStream os= null;
        try {
            //1.创建Socket对象，指明服务器端的ip和端口号
            InetAddress inet1=InetAddress.getByName("127.0.0.1");
            socket = new Socket(inet1,8899);
            //2.获取一个输出流，用于输出数据
            os = socket.getOutputStream();
            //3.写出数据的操做
            os.write("你好，我是客户端mm".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //资源的关闭
            try {
                if (os!=null)
                    os.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            try {
                if (socket!=null)
                    socket.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }

    }

    //服务端
    @Test
    public void server(){
        ServerSocket serverSocket= null;
        Socket socket= null;
        InputStream is= null;
        ByteArrayOutputStream baos= null;
        try {
            //1.创建服务器端对的ServerSocket，指明自己的端口号
            serverSocket = new ServerSocket(8899);
            //2.调用accept（）表示接收来自于客户端的socket
            socket = serverSocket.accept();
            //3.获取输入流
            is = socket.getInputStream();

//        不建议这样写，可能会有乱码
//        byte[] buffer=new byte[20];
//        int len;
//        while((len = is.read(buffer)) != -1){
//            String str=new String(buffer,0,len);
//            System.out.print(str);
            //4.读取输入流中的数据
            baos = new ByteArrayOutputStream();
            byte[] buffer=new byte[5];
            int len;
            while((len=is.read(buffer))!=-1){
                baos.write(buffer,0,len);
            }

            System.out.println(baos.toString());
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            //5.资源关闭
            try {
                if (baos!=null)
                    baos.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            try {
                if (is!=null)
                    is.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            try {
                if (socket!=null)
                    socket.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            try {
                if (serverSocket!=null)
                    serverSocket.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
    }
}
